One of the Best Inventions

THIS has got to be one of the best (or at least pretty great) inventions of all time.  What is it?!  It's a bell.  What's so great about a bell, you say?  If you want more water at a restaurant, just press it and the server will come.  If you want to order your food, just press it and the server will come.  If you want your bill, just press it and the server will come.  I think you get the idea.

Many, many restaurants in Korea have bells just like this.  Servers will leave you alone until you press this bell.  At first, I felt pretty rude pressing it.  Now, I hate when restaurants don't have it.  Some bells are on the wall and some are directly on the table.  When you press the bell, your table number shows up on a small box on one of the restaurant walls.  (It's similar to a restaurant giving you a number to wait to be seated.)  When your number shows up on the box, a server comes over.  Otherwise they leave you alone.  It's a perfect system in my point of view!